Fig. 3.

Reaction times and linear fits for 1st PP trials in both attention conditions of experiment 2. Left Cooperation group. Right Competition group. The single-attention condition is depicted in grey (squares), the joint-attention condition in black (triangles). The linear trend line for the single condition is depicted in grey, R ² = .99 in the cooperation group and R ² = .98 in the competition group. The linear trend line for the joint condition is shown in black, R ² = .95 in the cooperation group and R ² = .97 in the competition group